What do you mean not make it?
He has been playing in the Prem League a while now. Has had one very good season and plenty of other good games in the rest. A quick look at stats gives something like 25 goals in 160 games and I dunno how many assists. He is, at the very least, a decent Premiership player. At the very least. I would say that he has of course made it at Everton. His bad games and bad runs of form/confidence do not negate the positives.
I think when you say never make it at Everton its a good example of the problem coming from many fans and the media. I think what you are really saying is he has not become the great footballer many thought he would. He can't win if thats always the benchmark. His contribution so far is, again at the very least, worthy of a place in our squad in the premier league and when in form he is worthy of that starting place.
As for his confidence...lots of players suffer from that but yeah he does seem mentally weaker than many. However, as others are saying above, lets see how things go for him when we get a more solid team and things are looking good in general for the club. I wouldnt want him binned off for looking poor in the mess we have been for a couple of years.
As I've said before if he doesn't get more consistent or move up a level he is still good enough to be a squad option for us, and I am happy to have a local boy and a blue in there that can contribute when needed, and that can really shine if only occasionally.